Drag the thing.
Feel the law.
This is for the questions you've been carrying since you were five. Why is the sky blue? How can one rope lift a piano? Where does the Moon's missing piece go? There are answers here, but mostly there are little machines you can play with until the answer just clicks.
One page, one question, one machine
Every page is built around a working model of the thing it explains. We call them plates, after the numbered figures in old reference books, except these ones move when you grab them. Drag the sun down to the horizon and the sky goes through a real sunset. Pull on the pulley and you can feel the bargain it's offering. The words on the page are there to back up what you just saw with your own hands, not to do the work for you.
Every answer, written twice
There's a switch on every page: Like I'm 8 and The full picture. Flip it and the whole page rewrites itself. Same question, same simulator, two depths. A kid gets a straight answer in plain words. A grown-up gets the actual physics, equations and all. Here's a tip though: read the simple version first, even if you already know the topic. If it catches you off guard, the full version will mean more when you get there.
What we promise
A few things. The physics is real. Every plate runs the genuine model, trimmed down but never faked, so what you pick up here still holds up when you go deeper. Pages are named after the question you'd actually blurt out, not the chapter heading it hides under at school. And it's all free to read, with no account to make and nothing to install.
Where this is going
There are about two hundred questions on the list so far, ordered by how often people really ask them. After the school staples, that means your own body, the weather, animals, and the machines around the house. New pages go up a handful at a time, and nothing goes up until it's good enough that you'd want to send it to a friend.
Pick something you've always wondered about. The machine is already running.